| 摘要 |
PURPOSE:To eliminate a drift due to temperature change by constituting an apparatus by the use of a spring having an elongation due to thermal expansion equal to the variation due to thermal expansion of an arm tip. CONSTITUTION:A mechanical amplifier mechanism has a structure, where a pair of lever arms 4 respectively connected with the displacement transmission system 2 and base 3 facing each other of a piezoelectric element 1 and a spring 5 supported by said lever arms in the manner of being held between them are connected with each other. In consideration of thermal expansion coefficients of said lever arms 4 and spring 5, materials are combined with each other so that the variation due to thermal expansion of the tip of said lever arm 4 is equal to the elongation due to thermal expansion of the central part of said spring 5. Thus, a drift due to temperature change can be eliminated and the same correct output as that at an ordinary temperature can be obtained even if this apparatus is operated at a high temperature. |
